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/* page.h: Various defines and such for MMU operations on the Sparc for
the Linux kernel.
Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
*/
#ifndef _SPARC_PAGE_H
#define _SPARC_PAGE_H
#include <asm/asi.h> /* for get/set segmap/pte routines */
#include <asm/contregs.h> /* for switch_to_context */
#define PAGE_SHIFT 12 /* This is the virtual page... */
#ifndef __ASSEMBLY__
#define PAGE_SIZE (1UL << PAGE_SHIFT)
/* to mask away the intra-page address bits */
#define PAGE_MASK (~(PAGE_SIZE-1))
#ifdef __KERNEL__
/* The following structure is used to hold the physical
* memory configuration of the machine. This is filled
* in probe_memory() and is later used by mem_init() to
* set up mem_map[]. We statically allocate 14 of these
* structs, this is arbitrary. The entry after the last
* valid one has num_bytes==0.
*/
struct sparc_phys_banks {
unsigned long base_addr;
unsigned long num_bytes;
};
#define CONFIG_STRICT_MM_TYPECHECKS
#ifdef CONFIG_STRICT_MM_TYPECHECKS
/*
* These are used to make use of C type-checking..
*/
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
#define pte_val(x) ((x).pte)
#define pmd_val(x) ((x).pmd)
#define pgd_val(x) ((x).pgd)
#define pgprot_val(x) ((x).pgprot)
#define __pte(x) ((pte_t) { (x) } )
#define __pmd(x) ((pmd_t) { (x) } )
#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
#else
/*
* .. while these make it easier on the compiler
*/
typedef unsigned long pte_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;
#define pte_val(x) (x)
#define pmd_val(x) (x)
#define pgd_val(x) (x)
#define pgprot_val(x) (x)
#define __pte(x) (x)
#define __pmd(x) (x)
#define __pgd(x) (x)
#define __pgprot(x) (x)
#endif
/* The current va context is global and known, so all that is needed to
* do an invalidate is flush the VAC.
*/
#define invalidate() flush_vac_context() /* how conveeeiiiiinnnient :> */
#define copy_page(from,to) memcpy((void *) to, (void *) from, PAGE_SIZE)
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
#define PAGE_OFFSET 0
#define MAP_NR(addr) (((unsigned long)(addr)) >> PAGE_SHIFT)
#define MAP_PAGE_RESERVED (1<<15)
#endif /* !(__ASSEMBLY__) */
/* The rest is kind of funky because on the sparc, the offsets into the mmu
* entries are encoded in magic alternate address space tables. I will
* probably find some nifty inline assembly routines to do the equivalent.
* Much thought must go into this code. (davem@caip.rutgers.edu)
*/
/* Bitfields within a Sparc sun4c PTE (page table entry). */
#define PTE_V 0x80000000 /* valid bit */
#define PTE_ACC 0x60000000 /* access bits */
#define PTE_W 0x40000000 /* writable bit */
#define PTE_P 0x20000000 /* privileged page */
#define PTE_NC 0x10000000 /* page is non-cacheable */
#define PTE_TYP 0x0c000000 /* page type field */
#define PTE_RMEM 0x00000000 /* type == on board real memory */
#define PTE_IO 0x04000000 /* type == i/o area */
#define PTE_VME16 0x08000000 /* type == 16-bit VME area */
#define PTE_VME32 0x0c000000 /* type == 32-bit VME area */
#define PTE_R 0x02000000 /* page has been referenced */
#define PTE_M 0x01000000 /* page has been modified */
#define PTE_RESV 0x00f80000 /* reserved bits */
#define PTE_PHYPG 0x0007ffff /* phys pg number, sun4c only uses 16bits */
extern __inline__ unsigned long get_segmap(unsigned long addr)
{
register unsigned long entry;
__asm__ __volatile__("lduba [%1] 0x3, %0" :
"=r" (entry) :
"r" (addr));
return (entry&0x7f);
}
extern __inline__ void put_segmap(unsigned long addr, unsigned long entry)
{
__asm__ __volatile__("stba %1, [%0] 0x3" : : "r" (addr), "r" (entry&0x7f));
return;
}
extern __inline__ unsigned long get_pte(unsigned long addr)
{
register unsigned long entry;
__asm__ __volatile__("lda [%1] 0x4, %0" :
"=r" (entry) :
"r" (addr));
return entry;
}
extern __inline__ void put_pte(unsigned long addr, unsigned long entry)
{
__asm__ __volatile__("sta %1, [%0] 0x4" : :
"r" (addr),
"r" (entry));
return;
}
extern __inline__ void switch_to_context(int context)
{
__asm__ __volatile__("stba %0, [%1] 0x2" : :
"r" (context),
"r" (0x30000000));
return;
}
extern __inline__ int get_context(void)
{
register int ctx;
__asm__ __volatile__("lduba [%1] 0x2, %0" :
"=r" (ctx) :
"r" (0x30000000));
return ctx;
}
typedef unsigned short mem_map_t;
#endif /* __KERNEL__ */
#endif /* _SPARC_PAGE_H */
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